Of course it is. I used to do the Sunday Morning Ride out here from Mill Valley to Inverness. Lots of fun and a decent breakfast. Much of the rest of the group continued on afterwards to Marshall. That was time for me to head home. The more I rode it the faster I got. But that was never nearly as fast as other riders who'd been riding it longer and much faster than me. How much practice they had was irrelevant to me. I rode up to but not including the point where it stopped being fun to me.
Same goes for this downhill fun. I'm sure they have. That's more fun than I want to have in a single day. Nothing I said reflected their ability or good sense. It's just not something that would be fun for me. I lean towards riding not racing or rubbing'. At the end of the day that's really the only important takeaway.